A pulse dialing system for a VoIP modem includes a subscriber line interface circuit (SLIC) for interfacing analog telephone signals to digital signals, a relay for selectively connecting a telephone set with a public switched telephone network (PSTN) or with the SLIC, and a control means, coupled to the SLIC and to the relay, for receiving a digit of a dialed telephone number and for controlling the relay to connect the telephone set with the PSTN and with the SLIC alternatively for a number of cycle(s) equal to the digit of the dialed telephone number so as to generate pulse dialing signals to the PSTN.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for generating pulse dialing signals to a public switched telephone network (PSTN) by a VoIP (Voice over Internet Protocol) modem having a relay for selectively connecting a telephone set with the PSTN or with a subscriber line interface circuit (SLIC) of the VoIP modem, the method comprising: switching the relay to connect the telephone set with the PSTN and with the SLIC alternatively for a number of cycle(s) equal to a digit of a dialed telephone number.
2. A pulse dialing system for a VoIP modem, comprising: a subscriber line interface circuit (SLIC) for interfacing analog telephone signals to digital signals; a relay for selectively connecting a telephone set with a public switched telephone network (PSTN) or with the SLIC; and a control means, coupled to the SLIC and to the relay, for receiving a digit of a dialed telephone number and for controlling the relay to connect the telephone set with the PSTN and with the SLIC alternatively for a number of cycle(s) equal to the digit of the dialed telephone number so as to generate pulse dialing signals to the PSTN.
3. The system of claim 2 , wherein said control means is a digital signal processor.
4. A method for making a pulse dialing telephone call with a public switched telephone network (PSTN) by a VoIP (Voice over Internet Protocol) modem including a control means and a relay for selectively connecting a telephone set with the PSTN or with a subscriber line interface circuit (SLIC) of the VoIP modem, the method comprising: receiving a dialed telephone number in the control means; and controlling the relay by the control means to connect the telephone set with the PSTN and with the SLIC alternatively for a number of cycle(s) equal to each dialed digit of the telephone number so as to generate pulse dialing signals to the PSTN.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
August 16, 2002
July 5, 2005
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